US8715151B2 - Blood flow meter - Google Patents
Blood flow meter Download PDFInfo
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- US8715151B2 US8715151B2 US13/866,740 US201313866740A US8715151B2 US 8715151 B2 US8715151 B2 US 8715151B2 US 201313866740 A US201313866740 A US 201313866740A US 8715151 B2 US8715151 B2 US 8715151B2
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
- A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
- A61M60/148—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/20—Type thereof
- A61M60/205—Non-positive displacement blood pumps
- A61M60/216—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/50—Details relating to control
- A61M60/508—Electronic control means, e.g. for feedback regulation
- A61M60/515—Regulation using real-time patient data
- A61M60/531—Regulation using real-time patient data using blood pressure data, e.g. from blood pressure sensors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/50—Details relating to control
- A61M60/508—Electronic control means, e.g. for feedback regulation
- A61M60/538—Regulation using real-time blood pump operational parameter data, e.g. motor current
- A61M60/554—Regulation using real-time blood pump operational parameter data, e.g. motor current of blood pressure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/855—Constructional details other than related to driving of implantable pumps or pumping devices
- A61M60/857—Implantable blood tubes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
- A61M2205/3344—Measuring or controlling pressure at the body treatment site
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
- A61M2205/3351—Controlling upstream pump pressure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
- A61M2205/3355—Controlling downstream pump pressure
Definitions
- This document relates to blood pumps, and more particularly to materials and methods for measuring blood flow.
- Blood pumps can be used to provide mechanical assistance to the heart.
- the left ventricle pushes blood out of the heart, through the aorta, and into the body, while the right ventricle pushes blood from the body to the lungs. Since the left ventricle bears the majority of the heart's load, it often is the first part of the heart to require assistance.
- Ventricular assistance can be provided by, for example, a pump that is implanted in the abdomen in parallel with the cardiovascular system.
- an inflow conduit is attached to the left ventricle
- an outflow conduit is attached to the aorta. While some blood can follow its normal route out of the ventricle and into the aorta, other blood can pass through the pump, receive a boost, and be pushed into the body via the aorta.
- the motor speed of a rotary blood pump can directly affect the level of assistance provided by the pump, and typically requires careful control.
- Blood pumps generally can respond to changes in demand for blood, so that when a subject exercises, for example, the speed of the pump can be made to increase to ensure that the heart provides adequate blood to the body.
- the speed of a blood pump may require balance, however. For example, a pump should not run so slowly that blood does not leave the heart, nor run so quickly that it causes suction in the ventricle, which can lead to ventricle collapse.
- Rotary pumps typically are most effective when they run at the upper end of their range, however.
- blood pumps having one or more sensors positioned on or within the inflow conduit, the outflow conduit, or both.
- sensors can be used to assess left ventricular blood pressure and/or arterial blood pressure.
- blood pressure sensed at an inflow conduit can be an approximation of left ventricular pressure
- blood pressure sensed at an outflow conduit can be an approximation of arterial pressure.
- the speed of a blood pump can be adjusted based on information regarding the left ventricular and/or arterial pressure such that, for example, left ventricular pressure is maintained at a level that averts ventricular collapse, weaning of a patient from the pump is facilitated, and fusion of the aortic valve is avoided.
- sensors placed at inflow and/or outflow conduits can be used for continuous, periodic, or on demand monitoring of blood flow and chronic measurement of arterial pressure.
- the controller can be adapted to output information regarding the calculated blood flow for display.
- the blood flow calculation can be based on the left ventricular pressure and the arterial pressure, based on pressure changes within the blood pump, or based on motor speed and the pressure drop across the pump.
- the first and second sensors can be configured to detect left ventricular pressure and arterial pressure, respectively, on a continuous basis, on a periodic basis, or on an on-demand basis.
- this document features a method for measuring blood flow in a subject having a blood pump system, comprising detecting left ventricular pressure via a sensor present on an inflow conduit of the blood pump system, detecting arterial pressure via a sensor present on an outflow conduit of the blood pump system, calculating blood flow based on the difference between the left ventricular pressure and the arterial pressure, and outputting the calculated blood flow for display.
- the left ventricular pressure and the arterial pressure can be detected continuously, periodically, or on demand by a user.
- the method can further comprise retrieving stored information regarding pressure changes within the blood pump system.
- the step of calculating blood flow can further comprise determining a motor speed of a motor for a pump within the blood pump system based on power consumed by the motor or measured rotations of an impeller coupled to the motor.
- this document features a blood pump system comprising a blood pump having an inflow conduit for receiving blood from a right ventricle or right atrium of a heart and an outflow conduit for returning blood to a circulatory system, and a controller operably connected to the blood pump, wherein the inflow conduit comprises a first sensor located to detect an inflow conduit pressure that is substantially the same as right ventricular or right atrial pressure, wherein the sensor is adapted to send a signal regarding the inflow conduit pressure to the controller, wherein the outflow conduit comprises a second sensor located to detect an outflow conduit pressure that is substantially the same as pulmonary artery pressure, wherein the sensor is adapted to send a signal regarding the outflow conduit pressure to the controller, and wherein the controller is adapted to calculate blood flow through the blood pump.
- the inflow conduit comprises a first sensor located to detect an inflow conduit pressure that is substantially the same as right ventricular or right atrial pressure, wherein the sensor is adapted to send a signal regarding the inflow conduit pressure to the controller
- the outflow conduit comprises a
- the controller can be adapted to output information regarding the calculated blood flow for display.
- the blood flow calculation can be based on the right ventricular or right atrial pressure and the pulmonary artery pressure, based on pressure changes within the blood pump, or based on motor speed and the pressure drop across the pump.
- the first and second sensors can be configured to detect right ventricular or right atrial pressure and pulmonary artery pressure, respectively, on a continuous basis, on a periodic basis, or on an on-demand basis.
- FIG. 3 is a flow diagram depicting an embodiment of a method for maintaining left ventricular pressure above a threshold level.
- FIG. 4 is a flow diagram depicting an embodiment of a method for gradually weaning a subject off a blood pump system.
- FIG. 5 is a flow diagram depicting an embodiment of a method for preventing aortic valve fusion in a subject having a blood pump system.
- blood pump 10 as described herein can include pump housing 50 , inflow conduit 60 , and outflow conduit 70 .
- sensor 65 can be positioned on an interior surface of inflow conduit 60
- sensor 75 can be positioned on an interior surface of outflow conduit 70 .
- Sensors 65 and 75 can be located at any suitable position on conduits 60 and 70 (e.g., proximal to pump housing 50 or, as shown in FIG. 1 , distal to pump housing 50 ).
- a sensor can be within about 1 to about 2 cm (e.g., within about 0.75, about 1, about 1.25, about 1.5, about 1.75, about 2, or about 2.25 cm) from pump housing 50 and, for example, prior to any flexible member of blood pump 10 .
- a sensor can be positioned on the exterior surface of an inflow or outflow conduit (e.g., a flexible inflow or outflow conduit).
- a sensor can be, for example, a microelectromechanical system (MEMS), or a MEMS type transducer.
- MEMS microelectromechanical system
- Sensors 65 and 75 can serve a variety of purposes.
- Information regarding blood pressure and/or blood flow measured by sensor(s) on a blood pump can be sent to controller 80 , which can be connected to the sensor(s) (e.g., via one or more leads, such as leads 82 and 84 ) or, as in other embodiments, via a wireless configuration and electrically transmitted.
- a controller can chronically monitor detected blood pressure.
- a sensor positioned on an outflow conduit can constantly, periodically, or on demand send information regarding detected blood pressure to a controller, allowing for chronic monitoring of arterial pressure since, as mentioned above, blood pressure measured at an outflow conduit can be an approximation of arterial pressure.
- one or more sensors positioned at an inflow conduit, an outflow conduit, or both can send information regarding detected pressure to a controller (e.g., via one or more leads, or via wireless transmission).
- the controller in turn, can send a signal to the pump such that the speed of the pump is adjusted (e.g., increased or decreased) depending on the blood pressure at the inflow conduit, the outflow conduit, or both.
- Such embodiments can allow for controlled weaning from the pump, maintain left ventricular pressure within a desired range, avoid left ventricular collapse, determine blood pump flow, and prevent aortic valve fusion, for example.
- the controller can send a signal to the blood pump such that the speed of the pump is increased.
- the upper threshold pressure level can be, for example, about 10 mm Hg to about 45 mm Hg greater than the lower threshold pressure.
- the upper threshold pressure can be about 55 mm Hg to about 150 mm Hg (e.g., about 55 mm Hg, about 60 mm Hg, about 65 mm Hg, about 70 mm Hg, about 75 mm Hg, about 80 mm Hg, about 85 mm Hg, about 90 mm Hg, about 95 mm Hg, about 100 mm Hg, about 110 mm Hg, about 120 mm Hg, about 130 mm Hg, about 140 mm Hg, or about 150 mm Hg), or any value there between.
- the controller can be adjusted by a clinician to set the threshold levels, and the threshold levels also can be changed as desired.
- a blood pump system can be useful to, for example, maintain left ventricular pressure within a preselected range while eliminating or avoiding left ventricular collapse.
- a method can include detecting left ventricular pressure in a subject having a blood pump system, via a sensor at an inflow conduit of the blood pump, and increasing, maintaining, or reducing the speed of the blood pump based on the detected inflow conduit pressure.
- the speed can be reduced if the detected left ventricular pressure is less than a lower threshold level (thus increasing the left ventricular pressure), and the speed can be increased if the detected left ventricular pressure is greater than an upper threshold level (thus decreasing the left ventricular pressure).
- the speed of the pump can be reduced if the detected right ventricular pressure is less than a lower threshold level (thus increasing the right ventricular pressure), and the speed can be increased if the detected right ventricular pressure is greater than an upper threshold level (thus decreasing the right ventricular pressure).
- a clinician can set the upper and lower threshold values, depending on the patient, and can program the blood pump system accordingly.
- the speed of a blood pump can be adjusted based only on whether the pressure measured at the inflow conduit is less than a lower threshold (e.g., as depicted in the flow diagram shown in FIG. 3 ). In such embodiments, the speed of the pump can be reduced if the detected pressure is less than a particular threshold, and can be maintained or increased if the detected pressure is not less than the threshold.
- the inflow conduit can have a sensor that can detect inflow conduit pressure that can be substantially the same as left ventricular pressure or right ventricular pressure, depending whether the system is placed to provide support to the systemic circulation or to the pulmonary circulation.
- the sensor can send a signal regarding the inflow conduit pressure to the controller, and the controller can send a signal to the blood pump such that the speed of the pump is reduced or maintained if the conduit pressure is less than a lower threshold level, or increased or maintained if the conduit pressure is greater than an upper threshold level.
- a system providing support to the systemic circulation can be configured to continually adjust the speed of the blood pump such that a positive systolic left ventricular pressure is maintained, and/or left ventricular end diastolic pressure is maintained within acceptable levels.
- the lower threshold level can be from about 5 mm Hg to about 20 mm Hg, or any value there between, and the upper threshold level can be from about 20 mm Hg to about 60 mm Hg, or any value there between.
- a blood pump system can include a first blood pump having a first inflow conduit for receiving blood from a left ventricle of a heart and a first outflow conduit for returning blood to a circulatory system, a second blood pump having a second inflow conduit for receiving blood from a right ventricle or right atrium of a heart and a second outflow conduit for returning blood to a pulmonary system; and a controller operably connected to the first and second blood pumps.
- the first inflow conduit can have a first inflow sensor located to detect a first conduit pressure that is substantially the same as left ventricular pressure, and the first inflow sensor can be adapted to send a signal regarding the first conduit pressure to the controller.
- the second inflow conduit can have a second inflow sensor located to detect a second conduit pressure that is substantially the same as right ventricular pressure or right atrial pressure, and the second inflow sensor can be adapted to send a signal regarding the second conduit pressure to the controller.
- the controller can send a signal to the first blood pump such that the speed of the first blood pump is reduced if the first conduit pressure is less than a first lower threshold level (e.g., a lower left ventricular systolic threshold level), or is maintained or increased if the first conduit pressure is greater than a first upper threshold level (e.g., an upper left ventricular systolic threshold level).
- a first lower threshold level e.g., a lower left ventricular systolic threshold level
- a first upper threshold level e.g., an upper left ventricular systolic threshold level
- the first lower threshold level can be, for example, from about 10 mm Hg to about 100 mm Hg (e.g., 10 mm Hg, 20 mm Hg, 30 mm Hg, 40 mm Hg, 50 mm Hg, 60 mm Hg, 70 mm Hg, 80 mm Hg, 90 mm Hg, or 100 mm Hg), or any value there between, and the first upper threshold level can be from about 20 mm Hg to about 150 mm Hg (e.g., 20 mm Hg, 30 mm Hg, 40 mm Hg, 50 mm Hg, 60 mm Hg, 70 mm Hg, 80 mm Hg, 90 mm Hg, 100 mm Hg, 110 mm Hg, 120 mm Hg, 130 mm Hg, 140 mm Hg, or 150 mm Hg), or any value there between.
- 10 mm Hg to about 100 mm Hg e.g., 10 mm Hg, 20 mm Hg, 30 mm Hg
- Such a system can be configured to continually adjust the speed of the first blood pump such that a positive left ventricular pressure is maintained (e.g., a systolic left ventricular pressure in the range of 5 mm Hg to 50 mm Hg, or 10 mm Hg to 40 mm Hg).
- a positive left ventricular pressure e.g., a systolic left ventricular pressure in the range of 5 mm Hg to 50 mm Hg, or 10 mm Hg to 40 mm Hg).
- the controller also can send a signal to the second blood pump such that its speed is reduced if the second conduit pressure is less than a second lower threshold level (e.g., a lower right ventricular systolic threshold level), or is maintained or increased if the second conduit pressure is greater than a second upper threshold level (e.g., an upper right systolic threshold level).
- a second lower threshold level e.g., a lower right ventricular systolic threshold level
- a second upper threshold level e.g., an upper right systolic threshold level
- the second lower threshold level can be from about 5 mm Hg to about 20 mm Hg (e.g., 5 mm Hg, 10 mm Hg, 15 mm Hg, or 20 mm Hg), or any value there between, and the second upper threshold level can be from about 20 mm Hg to about 60 mm Hg (e.g., 20 mm Hg, 30 mm Hg, 40 mm Hg, 50 mm Hg, or 60 mm Hg), or any value there between.
- Such a blood pump system can be useful to, for example, continuously adjust the speed of the blood pump in order to maintain systolic left ventricular pressure within a narrow range, and also to assist in weaning the subject off the system.
- the speed of the blood pump is determined not by blood flow, but rather by the changing pressure generated by the left ventricle itself.
- the speed of the blood pump is determined by the changing pressure generated by the right ventricle.
- a method for using such a blood pump system can include detecting left or right ventricular pressure, or both left and right ventricular pressure, via one or more inflow conduit sensors, and increasing, maintaining, or decreasing the speed of the blood pump based on the detected ventricular pressure(s). For example, the pump speed can be increased if the detected inflow conduit pressure is greater than an upper threshold level, and decreased if the detected inflow conduit pressure is less than a lower threshold level.
- a clinician can set the upper and lower thresholds on the controller, and can adjust the thresholds as desired.
- a blood pump system as described herein can facilitate weaning by shutting down for a particular length of time or number of heart beats, for example, and then starting up again (e.g., to return to the previously set speed).
- Such systematic reduction in the amount of support that the system provides to a subject can allow for recovery of the subject's own heart, and can enable subsequent removal of the blood pump from the subject. For example, full cardiac support may be accomplished when the maximum amount of blood is pumped out of the left ventricle without left ventricular collapse.
- Methods for weaning a patient from a blood pump can include a step-wise reduction of blood flow through the pump.
- the heart must rest, however, to allow recovery before it can fully take over the pumping function. This can be accomplished by gradually increasing the amount of time the biologic heart spends in partial support, while gradually decreasing the amount of time that the blood pump provides support.
- partial support by the biologic heart can be allowed for a short period of time (e.g., as selected by a clinician), after which the pump speed can be increased to provide full support for a second length of time.
- Such an alternating low flow, high flow cycle can be repeated any number of times and as often as desired, to ensure that arterial pressure does not decrease appreciably during the times at which the biologic heart provides partial support.
- a drop in arterial pressure can indicate that the biologic heart is not capable of producing sufficient blood flow in response to biologic demand. If a drop in pressure occurs, the motor speed can be automatically increased to full flow status. If a drop in pressure does not occur, the length of time in the partial support period can be increased (e.g., incrementally), provided that arterial pressure remains stable. Partial support provided by the biologic heart for increasingly extended periods of time with adequate arterial pressure and low end diastolic pressure in the left ventricle can indicate cardiac recovery. In contrast, high end diastolic pressure can indicate cardiac failure.
- an exemplary method for facilitating weaning of a subject from a blood pump can include the following steps:
- the starting point for step (2) can vary.
- the blood pump initially can be slowed down for one to five minutes (e.g., for one, two, three, four, or five minutes), and that time then can be increased in subsequent cycles of the method.
- Appropriate starting points can be determined by a clinician, for example.
- Another exemplary method for facilitating weaning of a subject from a blood pump providing support to the pulmonary circulation can include the following steps: (1) adjusting the pump motor speed to maintain a selected right ventricular pressure between about 5 mm Hg and about 20 mm Hg;
- blood flow measurements can be used as the control parameter, rather than pressure measurements.
- a blood pump can be operated at full support level, and blood pump flow can be established. Weaning then can be initiated by reducing the pump speed to reduce the flow by about 0.5 lpm to about 1.5 lpm (e.g., about 0.75 lpm, about 1 lpm, or about 1.5 lpm). Such a procedure can be carried out in steps, using time periods selected by a clinician, for example. Pump flow typically is not reduced to a level less than 1.0 lpm for long periods of time (e.g., 30 minutes).
- arterial pressure can be monitored at each level to ascertain that it has not decreased appreciably or that the left ventricular end diastolic pressure has not risen appreciably.
- the motor speed can be increased to a level at which arterial pressure can be maintained.
- pulmonary artery pressure and/or central venous pressure (CVP) can be monitored at each level to ascertain that it has not decreased appreciably or that right ventricular pressure end diastolic pressure has not risen appreciably. If the end diastolic pressure or the CVP rises above a threshold level (e.g., 10 mm Hg to 20 mm Hg), the method can include increasing the pump motor speed.
- a threshold level e.g. 10 mm Hg to 20 mm Hg
- a system as described herein can be used to provide data based on blood pressure and/or flow at an outflow conduit.
- a blood pump system can be used for continuous, periodic, or on demand monitoring of arterial pressure (i.e., pressure of circulating blood on the arteries), or monitoring of pulmonary artery pressure, based on the pressure detected at an outflow conduit.
- a blood pump system can include a blood pump having an inflow conduit for receiving blood from a heart (e.g., from the left ventricle or the right ventricle) and an outflow conduit for returning blood to a circulatory system (e.g., via the aorta) or to the pulmonary circulation, and a controller operably connected to the blood pump, where the outflow conduit has a sensor that can detect outflow conduit pressure.
- the outflow conduit pressure can be substantially the same as arterial pressure when the outflow conduit returns blood to the circulatory system via the aorta, for example, or can be substantially the same as pulmonary artery pressure when the outflow conduit returns blood to the pulmonary circulation.
- the sensor can detect outflow conduit pressure on a continual basis or on a periodic basis (e.g., every second, every two seconds, every ten seconds, every 30 seconds, every minute, every two minutes, every five minutes, every 10 minutes, every hour, or less often).
- the sensor can be configured to detect outflow conduit pressure on demand from a user or a clinician, for example.
- the sensor can be adapted to send a signal regarding the outflow conduit pressure to the controller and/or to a display.
- the display can be part of the controller.
- a blood pump system as provided herein can be used in methods for monitoring arterial or pulmonary artery pressure in a subject.
- a method can include using a sensor located in an outflow conduit of a blood pump system to detect arterial pressure in a subject on a repeated basis, and outputting the detected arterial pressure for display.
- a method can include using a sensor located in an outflow conduit of a blood pump system to detect pulmonary artery pressure in a subject on a repeated basis, and outputting the detected pulmonary artery pressure for display.
- the sensor can detect conduit pressure on a continual basis or on a periodic basis (e.g., every second, every two seconds, every ten seconds, every 30 seconds, every minute, every two minutes, every five minutes, every 10 minutes, every hour, or less often), for example.
- the sensor can be configured to detect outflow conduit pressure on demand from a subject (e.g., a user or a clinician).
- the controller can be adapted to send a signal to the blood pump such that the speed of the blood pump (e.g., the speed of a motor in the blood pump) is periodically and transiently adjusted (e.g., reduced) so that left ventricular pressure increases.
- the speed of the blood pump e.g., the speed of a motor in the blood pump
- transiently adjusted e.g., reduced
- Such embodiments can be useful, for example, in subjects having blood pump systems that bypass the aortic valve, such that the aortic valve does not regularly open and close.
- Increasing left ventricular pressure by reducing pump speed can force the heart to pump blood through the aortic valve, thus forcing the aortic valve to open and reducing the likelihood that the valve will fuse shut while the pump is in use within the subject.
- left ventricular pressure does not necessarily need to exceed the arterial pressure in order for the aortic valve to open, since the valve typically can open if the left ventricular pressure is equal to the arterial pressure.
- the speed of the pump only needs to be reduced such that left ventricular pressure and arterial pressure are substantially equal, although in some embodiments the speed can be reduced such that left ventricular pressure exceeds arterial pressure.
- left ventricular pressure can equal or exceed arterial pressure during systole, such that the aortic valve opens when the left ventricle contracts.
- pump speed can be decreased for a particular length of time (e.g., 5 to 30 seconds) at particular intervals of time (e.g., every 5 to 20 minutes), or can be decreased for a particular number of heart beats (e.g., 5 to 30 beats) at particular intervals (e.g., every 300 to 1200 beats).
- the reduced pump speed can occur over a length of time sufficient to permit washing of the aortic valve sinus.
- the pump speed can be increased (e.g., to return to a previously set level), so that left ventricular pressure decreases relative to arterial pressure.
- FIG. 5 A flow diagram showing an example of such a method is presented in FIG. 5 .
- a blood pump system having sensors at both an inflow conduit and an outflow conduit can be used as a blood flow meter. Such systems can be used for continuous, periodic, or on demand monitoring of blood flow through the pump.
- a blood pump system can include, for example, a blood pump with an inflow conduit for receiving blood from the heart (e.g., from the left ventricle) and an outflow conduit for returning blood to the circulatory system (e.g., via the aorta), and a controller operably connected to the blood pump, wherein the inflow conduit has a first sensor for detecting an inflow conduit pressure and the outflow conduit has a second sensor for detecting an outflow conduit pressure.
- the inflow conduit pressure can be substantially the same as left ventricular pressure, and the first sensor can be adapted to send a signal regarding the inflow conduit pressure to the controller.
- the outflow conduit pressure can be substantially the same as arterial pressure, and the sensor can be adapted to send a signal regarding the outflow conduit pressure to the controller.
- the controller in turn, can be adapted to calculate blood flow through the pump based on the inflow conduit pressure and the outflow conduit pressure. Blood flow calculation can be based, for example, on blood pump motor speed and on pressure changes within the blood pump (e.g., the pressure drop across the pump). In some cases, the controller can be adapted to output information regarding calculated blood flow for display (e.g., on a continuous, periodic, or on-demand basis).
- This document also provides a method for measuring blood flow through a blood pump in a subject.
- the method can include detecting left ventricular pressure via a sensor present at an inflow conduit of the blood pump, detecting arterial pressure via a sensor present at an outflow conduit of the blood pump, and calculating blood flow based on the difference between the left ventricular pressure and the arterial pressure.
- a blood flow calculation can be based on the pressure drop across the pump, as well as on motor speed.
- Information regarding blood flow can be output for display.
- Left ventricular and arterial pressures can be detected on a continuous, periodic, or on-demand basis.
- the method can include retrieving stored information regarding pressure changes within the blood pump.
- a blood pump Before such a blood pump is placed into the subject, it may be used in determining a constant for use in calculating the blood flow. For example, a technician can measure the flow rate across the pump to determine the pressure drop, and can derive a constant based on the particular configuration of the pump.
- the pump can be calibrated to determine the coefficient (multiplier) that can be used in calculation of blood flow after the blood pump has been connected to the subject and the pump system is in use. Blood pump flow can be calculated by the controller using the following equation:
- flow can be determined by using a “look up table” of flow as a function of the pressure drop across the pump, in combination with motor speed.
- the blood pump may be a rotary pump, a centrifugal blood pump, or any other type of blood pump.
- a blood pump controller e.g., controller 80
- Controller 80 can be implanted or used externally in association with any of the computer-implemented methods described previously, according to one implementation.
- Controller 80 may include various forms of digital computers, such as microcontrollers, customized application-specific integrated circuits (ASICs), programmable logic controllers (PLCs), distributed control systems (DCSs), remote terminal units (RTUs), laptops, and any other appropriate computers.
- ASICs application-specific integrated circuits
- PLCs programmable logic controllers
- DCSs distributed control systems
- RTUs remote terminal units
- a storage device can be capable of providing mass storage for controller 80 .
- a storage device can be a computer-readable medium.
- a storage device can be a hard disk device or an optical disk device.
- An input/output device can provide input/output operations for controller 80 .
- an input/output device can include a display unit for displaying graphical user interfaces. The display may have a touch screen interface for receiving input from a user. Additionally, a input/output device can include buttons, dials, and/or switches on the controller for receiving information from a user.
- the features described can be implemented in digital electronic circuitry, or in computer hardware, firmware, software, or in combinations thereof.
- the apparatus can be implemented in a computer program product tangibly embodied in an information carrier, e.g., in a machine-readable storage device for execution by a programmable processor; and method steps can be performed by a programmable processor executing a program of instructions to perform functions of the described implementations by operating on input data and generating output.
- the described features can be implemented advantageously in one or more computer programs that are executable on a programmable system including at least one programmable processor coupled to receive data and instructions from, and to transmit data and instructions to, a data storage system, at least one input device, and at least one output device.
- a computer program is a set of instructions that can be used, directly or indirectly, in a computer to perform a certain activity or bring about a certain result.
- a computer program can be written in any form of programming language, including compiled or interpreted languages, and it can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.
- Suitable processors for the execution of a program of instructions include, by way of example and not limitation, both general and special purpose microprocessors, and the sole processor or one of multiple processors of any kind of computer.
- a processor can receive instructions and data from a read-only memory or a random access memory, or both.
- the essential elements of a computer are a processor for executing instructions and one or more memories for storing instructions and data.
- a computer typically also will include, or be operatively coupled to communicate with, one or more mass storage devices for storing data files. Examples of such devices include magnetic disks, such as internal hard disks and removable disks magneto-optical disks, and optical disks.
- the features can be implemented on a computer having a display device such as a liquid crystal display (LCD) monitor for displaying information to the user.
- a display device such as a liquid crystal display (LCD) monitor for displaying information to the user.
- LCD liquid crystal display
- a blood pump to aid the left ventricle
- a blood pump with pressure transducers on the inlet and/or the outlet can be used to supplement flow from the right ventricle.
- the inlet conduit can be attached to the right atrium or the vena cava, which would indicate central venous pressure while the pump outlet conduit can be attached to the pulmonary artery (PA) to indicate PA pressure.
- PA pulmonary artery
Abstract
Description
Claims (16)
Flow=(pump outlet pressure−pump inlet pressure)×C,
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US8449444B2 (en) | 2013-05-28 |
WO2010099293A1 (en) | 2010-09-02 |
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